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(P0451) FUEL TANK PRESSURE SENSOR PERFORMANCE (CONTINUED) 4. MEASURE THE FUEL TANK PRESSURE SENSOR SIGNAL CIRCUIT VOLTAGE Turn the ignition off. Disconnect the Fuel Tank Pressure Sensor harness connector. Note: Check connectors — Clean/repair as necessary. Measure the voltage of the Fuel Tank Pressure Sensor Signal circuit at Is the voltage between 4.7 and 5.2 volts? Yes >> Go To 5 No >> If the voltage is above 5.2 volts, Go To 11 If the voltage is below 4.7 volts, Go To 12 5. MEASURE THE 5-VOLT SUPPLY CIRCUIT VOLTAGE With the ignition on. Measure the voltage of the 5-Volt Supply circuit at the Fuel Tank Pres- Is the voltage between 4.7 and 5.2 volts? Yes >> Go To 6 No >> If the voltage is above 5.2 volts, Go To 9 If the voltage is below 4.7 volts, Go To 10 6. FUEL TANK PRESSURE SENSOR SIGNAL CIRCUIT SHORT TO 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the PCM C4 harness connector. Note: Check connectors — Clean/repair as necessary. Is the resistance above 100 kohms? Yes >> Go To 7 No >> Repair the Fuel Tank Pressure Sensor Signal circuit for a short to the 5-Volt Supply circuit. Perform POWERTRAIN VERIFICATION TEST - VER 2. ZH ENGINE - ELECTRICAL DIAGNOSTICS 9 - 469 |